clarify that radix for int is not 'guessed'

Doc/library/functions.rst

@@ -571,14 +571,14 @@ available.  They are listed here in alphabetical order.
    it must contain a possibly signed decimal number representable as a Python
    integer, possibly embedded in whitespace.  The *radix* parameter gives the
    base for the conversion (which is 10 by default) and may be any integer in
-   the range [2, 36], or zero.  If *radix* is zero, the proper radix is guessed
-   based on the contents of string; the interpretation is the same as for
-   integer literals.  If *radix* is specified and *x* is not a string,
-   :exc:`TypeError` is raised. Otherwise, the argument may be a plain or long
-   integer or a floating point number.  Conversion of floating point numbers to
-   integers truncates (towards zero).  If the argument is outside the integer
-   range a long object will be returned instead.  If no arguments are given,
-   returns ``0``.
+   the range [2, 36], or zero.  If *radix* is zero, the proper radix is
+   determined based on the contents of string; the interpretation is the same as
+   for integer literals.  (See :ref:`numbers`.)  If *radix* is specified and *x*
+   is not a string, :exc:`TypeError` is raised. Otherwise, the argument may be a
+   plain or long integer or a floating point number.  Conversion of floating
+   point numbers to integers truncates (towards zero).  If the argument is
+   outside the integer range a long object will be returned instead.  If no
+   arguments are given, returns ``0``.
 
    The integer type is described in :ref:`typesnumeric`.